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H = <a href="%pathto:aib.vl_aibhist;">VL_AIBHIST</a>(PARENTS, DATA) computes the histogram of the data
points DATA on the VL_AIB tree defined by PARENTS. Each element of
DATA indexes one of the leaves of the VL_AIB tree.
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H = <a href="%pathto:aib.vl_aibhist;">VL_AIBHIST</a>(PARENTS, DATA, 'HIST') treats DATA as an histograms.
In this case each compoment of DATA is the number of occurences of
the VL_AIB leaves corresponding to that component.
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H has the same dimension of parents and counts how many data points
are descendent of the corresponding node of the VL_AIB tree.
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See also: <a href="%pathto:vl_help;">VL_HELP</a>(), <a href="%pathto:aib.vl_aib;">VL_AIB</a>(), <a href="%pathto:aib.vl_aibcutpush;">VL_AIBCUTPUSH</a>().
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